Undercutter-support.



W. J. WHITWORTH. UNDBRGUTTEB SUPPORT.

APPLICATION I'ILBD APR. 2E, 1909.

948,836. Patented Feb. 8, 1910.

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AMDREW a Gamm no., Mmc-Umounrnms. wnsmuclow D c WILLIAM JEFFERSON WHITWORTH, OF NQRTH BEND, OREGON.

UNDERCUTTER-SUPPORT.

Specification of Letters Patent.

Patented Fol. H, 1910.

Application filed April 26, 1909. Serial No. 492,265.

To all whom tt may concern.'

Be it known that I, lViLLiAM JnrvnnsoN inrrwonri-r, a citizen of the United States, and :l resident of North Bend, in the countyY ot' (floos and State of Oregon, have invented a new and Improved Undercutter-Support, of which the following is a full, clear, and exact description.

This invention relates to undercuttcr-supports for saws, and particularly to the means oi' adjusting the supportlng-arm, and to the j means of adjusting the holding-dog.

An object of this invention is to provide an improved means of adjusting the supporting-arm relative to the holding-dog.

Another object of this invention is to provide an improved means of adjusting the holding-dog relatively to the other parts.

These and other objects are to be more fully described hereinafter and particularly pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in Which like reference characters denote corresponding parts in both the views, in Which- Figure 1 is a perspective View of the device; and Fig. 2 is an enlarged view, partly in section, showing the means of adjusting the supporting-arm relatively to the other parts.

In sawing logs it is often advisable to saw them from the under side, and in order to have a suitable support for the saw it is ordinarily necessary to repeatedly V remove the supporting device from its resting point and adjust it relatively to the log. This invention has for its object to do away with this disa reeable task of removing the support, an the support relatively to the arm.

Referring particularly to the separate parts of the device, 1 represents thegpupport-l suitable:

ing-frame, which may be of anyform. As shown, it has a cylindrical portion 2 which has a slot 3 therein. Through this slot is adapted to slide a holding-dog 4. This holding-do is adjustable in the slot 3 and is adapte to be fastened in any adjusted position therein by means of a clamping-screw 5. This clamping-screw 5 is preferably in the form of an ang -piece having a screw-threaded-portion 6 on its short-er end, at the end of which is a curved bearing surface 7. The other end of the clamping-screw has a tapered square portion has a simple means of adjusting sawed to such a height that it is no longer 8. This portion is adapted lo be lengthened by means of a hollow bar in order to` give an additional leverage in either tightening or removing the screw. 'lhe other end ot the frame 1 has a projecting cylinder S) thereon. This projecting` cylinder Sl llas rcccsses 10 therein.

Pivotally supported on the traino l, by means of :l bifurcated end ll. is a supportv ing-arm 12. This supporting-arm 12 has u shank 13 extending` at an angle, on which is rotatably supported a saw-supporting roller 14. This saw-supporting roller has a plurality of grooves 15 in its circumference adapted to support the saw at variable distances from the arm 12. Supported on this arm 12 is a casing 1G, in which is adapted to slide a pawl 17. This pavvl 17 has a cylindrical head 18 which is adapted to fit in the recesses 10 in the supportingl frame 1. At the other end of' this paivl 17 1s a lingerhold 19 extending at an angle to the main body of the pawl. Vlithin the casing and surrounding the pavvl 17 is a spiral spring 20 Which is adapted to engage the casing 16 at one end and the flange on the head 18 at the other end, and tends to force the head of the pawl into the openings 10. The dog -t has on one end thereof, a sharpened point or edge 21.

In the operation of the device, the holding-dog 4 is inserted in the slot 3 and clamped in any suitable adjustment by means of the screw 5. Then the dog is forced into the log or in any suitable support adjacent to the lopr and the roller 14 adjusted at the angle and height desired. The back of the savv is rested in one of the grooves 15 on the roller 14 and the operation of sawing proceeded With. 1When the log has been convenient to continue the operation With ,the same adjustment of the supporting-arm, -"the saw is removed and the pawl 17 Withdrawn from the openings 1() and the arm adjusted to another height and another angle. The adjustment of the supportingarm 12 relative to the frame l ma be con- ..tinued even until it reaches a posit1on above the frame 1, so that any height of the roller 14 Within the limits of twice the length of the supporting-arm 12 may be reached. Having thus described my invention, I

claim as new and desire t-o secure by Letters Patent:

1. An undercutter-support comprising a frame. n holding-dog' mnneeted lo Suid trannie, :L supporting-:win pivolnlly Supported on Huid frame, and :i` lmwl on Said arm adapted to engage said lx'iilne to lool( Suid :11'111 to the ii'l'zxnle.

2. An nl'ldei'entter-Support comprising a` frame having' recesses, :i` holding-dog for `Quid frame, n supporting-arm pivoted toseid li'unle, :ind n pziwl on Said m'ln adapted to lit within the recesses in said frame to lock the 2mn relatively to the frame.

3. An undercutter-Support comprising u fl'nnie havingr recesses, il holding-dog :lcjnstable relatively to said frame, n supporting-arm pivoted to said flilnle, and u springpi'essed pnwl on Suid arm adapted to engage the I'eceeses in Said frame to lock the nl'ni relatively to the frame.

4. An undercutter-support comprising a slotted frame having recesses therein, u holding-dog' adjustable in the slotted frame, f1

looking-pin :adapted to look Sayid dog in its adjusted position, a suppoI'tiIif-a1-11'1 piveted to Suid trame, a spring-presse pawl onsaid ul'in adapted to engage Suid reeeshed traine to loek Suid sir-1n to the lrul'ne, und 1L grooved sul'iportilig roller rotatably supported on sind zu'm.

5. An under-eutte1-suli13o1t Comprising a lelolted frame, n` lmldii'lg-dog slidingly udjlistable in. .said slotted frame, :i screw loeking-holt for holdingl Said dog in its adjusted position, and :i Supporting-erin adjustable relatively to the frame.

In testimony whereof I have signed my nume to this specification in the preeenee ol two subscribing Witnesses.

WILLIAM JEFFERSON Wlll'l\\'0li'l`ll.

Witnesses:

AMES S. JOHNSTON, SARAH. JOHNSTON. 

